Is there a way to have mappro80 manage google map images and then allow me to overlay my own data on them? I like the capabilities of MapPro80 and don't really want to get a very expensive google license, but I like their maps, which I can get for free through http.

I think you need a license from Google to do that. It's also fairly expensive. It used to be ~$10k per year (for the lower # of transactions you could buy), but I think it may be up to ten times as much now